MODEL PAPER 10 — Physics STD 12 Science — Question

If the current is doubled, the deflection is also doubled in(a) A tangent galvanometer(b) A moving coil galvanometer(c) Both (a) and (b)(d) None of these

'Electrons revolve round the nucleus in well-defined orbits, like planets revolve round the sun' was the brainchild of:

A vertical straight conductor carries a current vertically upwards. A point P lies to the east of it at a small distance and another point Q lies to the west at the same distance the magnetic field at P is:

The impurity atoms with which pure silicon may be doped to make it a p-type semiconductor are those of:

An electric kettle has two heating coils. When one coil is used, water in the kettle boils in 5 minutes, while when second coil is used, same water boils in 10 minutes. If the two coils, connected in parallel are used simultaneously, the same water will boil in time(a) 3 min 20 sec(b) 5 min(c) 7 min 30 sec(d) 2 min 30 sec

What is the driving force in a working Electrical Circuit?

A normally incident ray reflected at an angle of 90°. The value of critical angle is(a) 45°(b) 90°(c) 65°(d) 43.2°